package com.cxy.contentcenter.configuration;

import com.alibaba.cloud.nacos.NacosDiscoveryProperties;
import com.alibaba.cloud.nacos.ribbon.NacosServer;
import com.alibaba.nacos.api.exception.NacosException;
import com.alibaba.nacos.api.naming.NamingService;
import com.alibaba.nacos.api.naming.pojo.Instance;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.List;

/**
 * @author: huayushu luming
 * @date: 2020-11-27 09:29
 * @desc: implements IRule
 **/
@Slf4j
public class NacosWeightedRule extends AbstractLoadBalancerRule {
    @Autowired
    private NacosDiscoveryProperties nacosDiscoveryProperties;

    @Override
    public void initWithNiwsConfig(IClientConfig iClientConfig) {
        //读取配置文件吗，并初始化NacosWeightedRule
    }

    @Override
    public Server choose(Object o) {
        try {
            BaseLoadBalancer baseLoadBalancer = (BaseLoadBalancer) this.getLoadBalancer();
            log.info("lb={}", baseLoadBalancer);
            //想要请求的微服务名称
            String name = baseLoadBalancer.getName();
            //实现负载均衡算法
            //拿到服务相关的api
            NamingService namingService = nacosDiscoveryProperties.namingServiceInstance();
            //nacos client自动通过基于权重的负载均衡算法，给我们选择一个实例

            Instance instance = namingService.selectOneHealthyInstance(name);
            log.info("选择的实例是：port={},instance={}", instance.getPort(), instance);
            return new NacosServer(instance);
        } catch (NacosException e) {
            e.printStackTrace();
            return  null;
        }
    }
}
